Remarkably enhanced low-temperature dehydrogenation kinetics of MgH₂ enabled by V-doped TiO₂

MgH₂ is a highly promising hydrogen storage material owing to its high hydrogen capacity. However, to fully exploit its potential, there is an urgent need for low-cost and stable catalysts to effectively improve its kinetic performance and reduce its operating temperature. Herein, V-doped TiO₂ was used as an efficient catalyst to improve the low-temperature hydrogen storage properties of MgH₂. The MgH₂-V-doped TiO₂ composite maintains a stable dehydrogenation at 175 °C. After complete dehydrogenation, it can rapidly absorb more than 4.5 wt% H₂ within 15 s even at room temperature. The enhanced catalytic performance is attributed to V doping, which optimizes the chemical environment of Ti and facilitates interfacial electron transfer between the catalyst and Mg/MgH₂. Overall, this study confirms the promising potential of element-doped modified TiO₂ as an effective catalyst for promoting the hydrogen sorption performance of MgH₂ under moderate conditions.